theme('image_example_image', array('image' => $image, 'style' => $style)), ); } // Use the #managed_file FAPI element to upload an image file. $form['image_example_image_fid'] = array( '#title' => t('Image'), '#type' => 'managed_file', '#description' => t('The uploaded image will be displayed on this page using the image style choosen below.'), '#default_value' => variable_get('image_example_image_fid', ''), '#upload_location' => 'public://image_example_images/', ); // Provide a select field for choosing an image style to use when displaying // the image. $form['image_example_style_name'] = array( '#title' => t('Image style'), '#type' => 'select', '#description' => t('Choose an image style to use when displaying this image.'), // The image_style_options() function returns an array of all available // image styles both the key and the value of the array are the image // style's name. The fucntion takes on paramater, a boolean flag // signifying wether or not the array should include a option. '#options' => image_style_options(TRUE), '#default_value' => variable_get('image_example_style_name', ''), ); // Submit Button. $form['submit'] = array( '#type' => 'submit', '#value' => t('Save'), ); return $form; } /** * Verify that the user supplied an image with the form.. */ function image_example_style_form_validate($form, &$form_state) { if (!isset($form_state['values']['image_example_image_fid']) || !is_numeric($form_state['values']['image_example_image_fid'])) { form_set_error('image_example_image_fid', t('Please select an image to upload.')); } } /** * Form Builder; Display a form for uploading an image. */ function image_example_style_form_submit($form, &$form_state) { // When using the #managed_file form element the file is automatically // uploaded an saved to the {file} table. The value of the corresponding // form element is set to the {file}.fid of the new file. // If fid is not 0 we have a valid file. if ($form_state['values']['image_example_image_fid'] != 0) { // The new file's status is set to 0 or temporary and in order to ensure // that the file is not removed after 6 hours we need to change it's status // to 1. Save the ID of the uploaded image for later use. $file = file_load($form_state['values']['image_example_image_fid']); $file->status = FILE_STATUS_PERMANENT; file_save($file); // When a module is managing a file, it must manage the usage count. // Here we increment the usage count with file_usage_add(). file_usage_add($file, 'image_example', 'sample_image', 1); // Save the fid of the file so that the module can reference it later. variable_set('image_example_image_fid', $file->fid); drupal_set_message(t('The image @image_name was uploaded and saved with an ID of @fid and will be displayed using the style @style.', array('@image_name' => $file->filename, '@fid' => $file->fid, '@style' => $form_state['values']['image_example_style_name']))); } // If the file was removed we need to remove the module's reference to the // removed file's fid, and remove the file. else if ($form_state['values']['image_example_image_fid'] == 0) { // Retrieve the old file's id. $fid = variable_get('image_example_image_fid', FALSE); $file = $fid ? file_load($fid) : FALSE; if ($file) { // When a module is managing a file, it must manage the usage count. // Here we decrement the usage count with file_usage_delete(). file_usage_delete($file, 'image_example', 'sample_image', 1); // The file_delete() function takes a file object and checks to see if // the file is being used by any other modules. If it is the delete // operation is cancelled, otherwise the file is deleted. file_delete($file); } // Either way the module needs to update it's reference since even if the // file is in use by another module and not deleted we no longer want to // use it. variable_set('image_example_image_fid', FALSE); drupal_set_message(t('The image @image_name was removed.', array('@image_name' => $file->filename))); } // Save the name of the image style choosen by the user. variable_set('image_example_style_name', $form_state['values']['image_example_style_name']); } /** * Theme function displays an image rendered using the specified style. */ function theme_image_example_image($variables) { $image = $variables['image']; $style = $variables['style']; // theme_image_style() is the primary method for displaying images using // one of the defined styles. The $variables array passed to the theme // contains the following two important values: // 'style_name': the name of the image style to use when displaying the // image. // 'path': the $file->uri of the image to display. // When given a style and an image path the function will first determine // if a derivative image already exists, in which case the existing image // will be displayed. If the derivative image does not already exist the // function returns an tag with a specially crafted callback URL // as the src attribute for the tag. When accessed, the callback URL will // generate the derivative image and serve it to the browser. $output = theme('image_style', array('style_name' => $style, 'path' => $image->uri, 'getsize' => FALSE)); $output .= '

' . t('This image is being displayed using the image style %style_name.', array('%style_name' => $style)) . '

'; return $output; }